27 lines
779 B
Plaintext
27 lines
779 B
Plaintext
'use strict';
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var supportsDescriptors = require('define-properties').supportsDescriptors;
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var getPolyfill = require('./polyfill');
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var gOPD = Object.getOwnPropertyDescriptor;
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var defineProperty = Object.defineProperty;
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var TypeErr = TypeError;
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var getProto = Object.getPrototypeOf;
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var regex = /a/;
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module.exports = function shimFlags() {
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if (!supportsDescriptors || !getProto) {
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throw new TypeErr('RegExp.prototype.flags requires a true ES5 environment that supports property descriptors');
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}
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var polyfill = getPolyfill();
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var proto = getProto(regex);
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var descriptor = gOPD(proto, 'flags');
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if (!descriptor || descriptor.get !== polyfill) {
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defineProperty(proto, 'flags', {
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configurable: true,
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enumerable: false,
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get: polyfill
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});
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}
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return polyfill;
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};
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